Most people use Imgur to upload the images.
After you uploaded it you need to grab the direct image link that ends in a file extension such as .jpg, .png or .gif.
You can get that link by:
1. rightclick, open image and copy the url from the bar at the top
2. rightclick, copy image url
3. click get share links on imgur and take the one labeled as 'BBCode (Forums)' but remove the IMG tags around it
Once you have the link, paste it here:
https://forums.d2jsp.org/settings.php?c=32Make sure the image you are using does not exceed 50kb